* [http://accessibility.linuxfoundation.org/a11yweb/util/accprobe/ AccProbe] for Firefox and Chrome, or [http://msdn.microsoft.com/en-us/library/dd318521%28v=vs.85%29.aspx Inspect] (available with Windows SDK) for IE

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* [http://www.full-windows8.com/2012/01/how-to-use-new-feature-narrator-in.html Narrator] for IE10 in Windows 8 (but not Firefox or Chrome).

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When Windows 8 comes out (October 2012?) you will be able to use the built-in screen reader called [http://www.full-windows8.com/2012/01/how-to-use-new-feature-narrator-in.html Narrator] for testing accessibility in IE (but not in Firefox or Chrome).

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* Inspector tools, such as [http://accessibility.linuxfoundation.org/a11yweb/util/accprobe/ AccProbe] for Firefox and Chrome, or [http://msdn.microsoft.com/en-us/library/dd318521%28v=vs.85%29.aspx Inspect] (available with Windows SDK) for IE

Testing Orion Accessibility

A great accessibility test is to put your mouse (and/or trackpad) out of reach and just use the keyboard for a while.
Every time you find yourself reaching for your visual pointing device, stop and think, "How do I do this with the keyboard"?
Need a menu? Type Alt. Context menu? Shift+F10. List of keyboard commands in Orion? Shift+? (or Alt+Shift+? from within the editor).
Every platform and every browser has a set of keyboard shortcuts. Refer to Wikipedia's Table of Keyboard Shortcuts and external links if necessary.
If you can't figure out how to do something with the keyboard in Orion, then maybe that something needs to be fixed.
If an important function takes too many keystrokes, maybe a key binding - or a refactoring - is needed.

After you become more proficient with keyboard navigation, start testing with a screen reader. Learn some of the screen reader's keyboard commands.
Try listening without looking at the monitor. Think you've got the keyboard aced? Turn off your monitor and see if you can last more than 30 seconds before turning it back on.

Linux

Chrome

Orion Documentation

Accessible documentation includes making sure that the text can stand alone without the images. If images are used to convey meaning, then suitable replacement text needs to be supplied.
Alternative text for an image in a wiki follows a vertical bar typed after the image file name, for example: [[Image:Orion-myimage.png|My Alternative Text]].
Exactly what the alternative text should say depends on context. For example, here are HTML5: Techniques for providing useful text alternatives.